From 2b291d3806d85d6a87963dfcc88750e89e147b2c Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 8 Oct 2005 10:15:50 +0000
Subject: * ext/iconv/charset_alias.rb: parse config.charset_alias file
 directly.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9357 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/iconv/charset_alias.rb | 46 ++++++++++++++++++++++++++++++++++++----------
 1 file changed, 36 insertions(+), 10 deletions(-)

(limited to 'ext/iconv/charset_alias.rb')

diff --git a/ext/iconv/charset_alias.rb b/ext/iconv/charset_alias.rb
index f1563b0dff..f3a54b8ddc 100644
--- a/ext/iconv/charset_alias.rb
+++ b/ext/iconv/charset_alias.rb
@@ -1,10 +1,11 @@
 #! /usr/bin/ruby
 require 'rbconfig'
+require 'optparse'
 
 # http://www.ctan.org/tex-archive/macros/texinfo/texinfo/intl/config.charset
 # Fri, 30 May 2003 00:09:00 GMT'
 
-OS = Config::CONFIG["target"]
+OS = Config::CONFIG["target_os"]
 SHELL = Config::CONFIG['SHELL']
 
 class Hash::Ordered < Hash
@@ -26,12 +27,26 @@ end
 def charset_alias(config_charset, mapfile, target = OS)
   map = Hash::Ordered.new
   comments = []
-  IO.foreach("|#{SHELL} #{config_charset} #{target}") do |list|
-    next comments << list if /^\#/ =~ list
-    next unless /^(\S+)\s+(\S+)$/ =~ list
-    sys, can = $1, $2
-    can.downcase!
-    map[can] = sys
+  match = false
+  open(config_charset) do |input|
+    input.find {|line| /^case "\$os" in/ =~ line} or return
+    input.find {|line|
+      /^\s*([-\w\*]+(?:\s*\|\s*[-\w\*]+)*)(?=\))/ =~ line and
+      $&.split('|').any? {|pattern| File.fnmatch?(pattern.strip, target)}
+    } or return
+    input.find do |line|
+      case line
+      when /^\s*echo "(?:\$\w+\.)?([-\w*]+)\s+([-\w]+)"/
+        sys, can = $1, $2
+        can.downcase!
+        map[can] = sys
+        false
+      when /^\s*;;/
+        true
+      else
+        false
+      end
+    end
   end
   case target
   when /linux|-gnu/
@@ -53,7 +68,7 @@ def charset_alias(config_charset, mapfile, target = OS)
   st.delete_if {|sys, i| i == 1}.empty?
   st.keys.each {|sys| st[sys] = nil}
   st.default = nil
-  open(mapfile, "w") do |f|
+  writer = proc do |f|
     f.puts("require 'iconv.so'")
     f.puts
     f.puts(comments)
@@ -71,7 +86,18 @@ def charset_alias(config_charset, mapfile, target = OS)
     end
     f.puts("end")
   end
+  if mapfile
+    open(mapfile, "w", &writer)
+  else
+    writer[STDOUT]
+  end
 end
 
-(2..3) === ARGV.size or abort "usage: #$0 config.status map.rb [target]"
-charset_alias(*ARGV)
+target = OS
+opt = nil
+ARGV.options do |opt|
+  opt.banner << " config.status map.rb"
+  opt.on("--target OS") {|t| target = t}
+  opt.parse! and (1..2) === ARGV.size
+end or abort opt.to_s
+charset_alias(ARGV[0], ARGV[1], target)
-- 
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